Not sure about 30D...since I am not a canon user, but 6 I6 d/ y- I; a% w7 w# K8 u" \ . v3 a, w7 _2 I4 I1 {For most of the Cameras, this sound is simulated, and it can be turned off in setting manu... % j) l: b' d! { 5 x% D1 v+ a% Q$ i# K0 EThe shutter and reflective lense sound seldom as loud as what you hear. If yes, they would be damaged very soon.